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                        多线程
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                            <b>0.1.</b>
                        
                        多线程
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                            <b>0.2.</b>
                        
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                            <b>0.3.</b>
                        
                        NSThread
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                            <b>0.3.1.</b>
                        
                        创建线程的方式
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                            <b>0.3.2.</b>
                        
                        NSThread 的 Target
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                            <b>0.3.3.</b>
                        
                        线程状态
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                            <b>0.3.4.</b>
                        
                        线程属性
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                            <b>0.3.5.</b>
                        
                        资源共享
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                            <b>0.3.6.</b>
                        
                        原子属性
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                            <b>0.3.7.</b>
                        
                        线程间通讯
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                            <b>0.4.</b>
                        
                        GCD
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                            <b>0.4.1.</b>
                        
                        同步 &amp; 异步
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                            <b>0.4.2.</b>
                        
                        block
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                            <b>0.4.3.</b>
                        
                        GCD 常用代码
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                            <b>0.4.4.</b>
                        
                        串行队列
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                            <b>0.4.5.</b>
                        
                        并发队列
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                            <b>0.4.6.</b>
                        
                        主队列
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                            <b>0.4.7.</b>
                        
                        同步任务的作用
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                            <b>0.4.8.</b>
                        
                        Barrier 异步
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                            <b>0.4.9.</b>
                        
                        全局队列
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                            <b>0.4.10.</b>
                        
                        延迟操作
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                            <b>0.4.11.</b>
                        
                        一次性执行
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                            <b>0.4.12.</b>
                        
                        调度组
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                            <b>0.5.</b>
                        
                        NSOperation
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                            <b>0.5.1.</b>
                        
                        基本演练
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                            <b>0.5.2.</b>
                        
                        高级演练
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                            <b>0.5.3.</b>
                        
                        与 GCD 的对比
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                            <b>0.5.4.</b>
                        
                        自定义操作
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                            <b>0.6.</b>
                        
                        异步加载图片
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                            <b>0.6.1.</b>
                        
                        搭建界面&amp;数据准备
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                            <b>0.6.2.</b>
                        
                        同步加载图像
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                            <b>0.6.3.</b>
                        
                        异步加载图像
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                            <b>0.6.4.</b>
                        
                        占位图像
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                            <b>0.6.5.</b>
                        
                        MVC
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                            <b>0.6.6.</b>
                        
                        操作缓冲池
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                            <b>0.6.7.</b>
                        
                        图像缓冲池
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                            <b>0.6.8.</b>
                        
                        代码重构
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                            <b>0.6.9.</b>
                        
                        内存警告
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                            <b>0.6.10.</b>
                        
                        黑名单
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                            <b>0.6.11.</b>
                        
                        沙盒缓存
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                            <b>0.6.12.</b>
                        
                        小结
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                            <b>0.6.13.</b>
                        
                        SDWebImage初体验
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                            <b>0.7.</b>
                        
                        仿SDWebImage
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                            <b>0.7.1.</b>
                        
                        下载操作
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                            <b>0.7.2.</b>
                        
                        测试下载操作
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                            <b>0.7.3.</b>
                        
                        下载管理器
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                            <b>0.7.4.</b>
                        
                        自定义 UIImageView
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                            <b>0.8.</b>
                        
                        SDWebImage
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                            <b>0.8.1.</b>
                        
                        第三方框架
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                            <b>0.8.2.</b>
                        
                        位移枚举
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                            <b>0.8.3.</b>
                        
                        NSCache
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                            <b>0.8.4.</b>
                        
                        SDWebImage常见面试题
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                            <b>0.9.</b>
                        
                        runloop
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                            <b>0.10.</b>
                        
                        自动释放池
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        <a href="./" >多线程</a>
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                        <h1 id="%E7%BA%BF%E7%A8%8B%E9%97%B4%E9%80%9A%E8%AE%AF">&#x7EBF;&#x7A0B;&#x95F4;&#x901A;&#x8BAF;</h1>
<h2 id="%E4%B8%BB%E7%BA%BF%E7%A8%8B%E5%AE%9E%E7%8E%B0">&#x4E3B;&#x7EBF;&#x7A0B;&#x5B9E;&#x73B0;</h2>
<h3 id="%E5%AE%9A%E4%B9%89%E5%B1%9E%E6%80%A7">&#x5B9A;&#x4E49;&#x5C5E;&#x6027;</h3>
<pre><code class="lang-objc"><span class="hljs-comment">/// &#x6839;&#x89C6;&#x56FE;&#x662F;&#x6EDA;&#x52A8;&#x89C6;&#x56FE;</span>
<span class="hljs-keyword">@property</span> (<span class="hljs-keyword">nonatomic</span>, <span class="hljs-keyword">strong</span>) <span class="hljs-built_in">UIScrollView</span> *scrollView;
<span class="hljs-comment">/// &#x56FE;&#x50CF;&#x89C6;&#x56FE;</span>
<span class="hljs-keyword">@property</span> (<span class="hljs-keyword">nonatomic</span>, <span class="hljs-keyword">weak</span>) <span class="hljs-built_in">UIImageView</span> *imageView;
<span class="hljs-comment">/// &#x7F51;&#x7EDC;&#x4E0B;&#x8F7D;&#x7684;&#x56FE;&#x50CF;</span>
<span class="hljs-keyword">@property</span> (<span class="hljs-keyword">nonatomic</span>, <span class="hljs-keyword">weak</span>) <span class="hljs-built_in">UIImage</span> *image;
</code></pre>
<h3 id="loadview">loadView</h3>
<ol>
<li>&#x52A0;&#x8F7D;&#x89C6;&#x56FE;&#x5C42;&#x6B21;&#x7ED3;&#x6784;</li>
<li>&#x7528;&#x7EAF;&#x4EE3;&#x7801;&#x5F00;&#x53D1;&#x5E94;&#x7528;&#x7A0B;&#x5E8F;&#x65F6;&#x4F7F;&#x7528;</li>
<li>&#x529F;&#x80FD;&#x548C; <code>Storyboard</code> &amp; <code>XIB</code> &#x662F;&#x7B49;&#x4EF7;&#x7684;</li>
</ol>
<blockquote>
<p>&#x5982;&#x679C;&#x91CD;&#x5199;&#x4E86; <code>loadView</code>&#xFF0C;<code>Storyboard</code> &amp; <code>XIB</code> &#x90FD;&#x65E0;&#x6548;</p>
</blockquote>
<pre><code class="lang-objc">- (<span class="hljs-keyword">void</span>)loadView {
    _scrollView = [[<span class="hljs-built_in">UIScrollView</span> alloc] init];
    _scrollView<span class="hljs-variable">.backgroundColor</span> = [<span class="hljs-built_in">UIColor</span> orangeColor];
    <span class="hljs-keyword">self</span><span class="hljs-variable">.view</span> = _scrollView;

    <span class="hljs-built_in">UIImageView</span> *iv = [[<span class="hljs-built_in">UIImageView</span> alloc] init];
    [<span class="hljs-keyword">self</span><span class="hljs-variable">.view</span> addSubview:iv];
    _imageView = iv;
}
</code></pre>
<h3 id="viewdidload">viewDidLoad</h3>
<ol>
<li>&#x89C6;&#x56FE;&#x52A0;&#x8F7D;&#x5B8C;&#x6210;&#x540E;&#x6267;&#x884C;</li>
<li>&#x53EF;&#x4EE5;&#x505A;&#x4E00;&#x4E9B;&#x6570;&#x636E;&#x521D;&#x59CB;&#x5316;&#x7684;&#x5DE5;&#x4F5C;</li>
<li>&#x5982;&#x679C;&#x7528;&#x7EAF;&#x4EE3;&#x7801;&#x5F00;&#x53D1;&#xFF0C;&#x4E0D;&#x8981;&#x5728;&#x6B64;&#x65B9;&#x6CD5;&#x4E2D;&#x8BBE;&#x7F6E;&#x754C;&#x9762; UI</li>
</ol>
<pre><code class="lang-objc">- (<span class="hljs-keyword">void</span>)viewDidLoad {
    [<span class="hljs-keyword">super</span> viewDidLoad];

    <span class="hljs-comment">// &#x4E0B;&#x8F7D;&#x56FE;&#x50CF;</span>
    [<span class="hljs-keyword">self</span> downloadImage];
}
</code></pre>
<h3 id="%E4%B8%8B%E8%BD%BD%E7%BD%91%E7%BB%9C%E5%9B%BE%E7%89%87">&#x4E0B;&#x8F7D;&#x7F51;&#x7EDC;&#x56FE;&#x7247;</h3>
<pre><code class="lang-objc">- (<span class="hljs-keyword">void</span>)downloadImage {
    <span class="hljs-comment">// 1. &#x7F51;&#x7EDC;&#x56FE;&#x7247;&#x8D44;&#x6E90;&#x8DEF;&#x5F84;</span>
    <span class="hljs-built_in">NSURL</span> *url = [<span class="hljs-built_in">NSURL</span> URLWithString:<span class="hljs-string">@&quot;http://c.hiphotos.baidu.com/image/pic/item/4afbfbedab64034f42b14da1aec379310a551d1c.jpg&quot;</span>];

    <span class="hljs-comment">// 2. &#x4ECE;&#x7F51;&#x7EDC;&#x8D44;&#x6E90;&#x8DEF;&#x5F84;&#x5B9E;&#x4F8B;&#x5316;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;(&#x7F51;&#x7EDC;&#x8BBF;&#x95EE;)</span>
    <span class="hljs-built_in">NSData</span> *data = [<span class="hljs-built_in">NSData</span> dataWithContentsOfURL:url];

    <span class="hljs-comment">// 3. &#x5C06;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;&#x8F6C;&#x6362;&#x6210;&#x56FE;&#x50CF;</span>
    <span class="hljs-built_in">UIImage</span> *image = [<span class="hljs-built_in">UIImage</span> imageWithData:data];

    <span class="hljs-comment">// 4. &#x8BBE;&#x7F6E;&#x56FE;&#x50CF;</span>
    <span class="hljs-keyword">self</span><span class="hljs-variable">.image</span> = image;
}
</code></pre>
<h3 id="%E8%AE%BE%E7%BD%AE%E5%9B%BE%E7%89%87">&#x8BBE;&#x7F6E;&#x56FE;&#x7247;</h3>
<pre><code class="lang-objc">- (<span class="hljs-keyword">void</span>)setImage:(<span class="hljs-built_in">UIImage</span> *)image {
    <span class="hljs-comment">// 1. &#x8BBE;&#x7F6E;&#x56FE;&#x50CF;&#x89C6;&#x56FE;&#x7684;&#x56FE;&#x50CF;</span>
    <span class="hljs-keyword">self</span><span class="hljs-variable">.imageView</span><span class="hljs-variable">.image</span> = image;

    <span class="hljs-comment">// 2. &#x6309;&#x7167;&#x56FE;&#x50CF;&#x5927;&#x5C0F;&#x8BBE;&#x7F6E;&#x56FE;&#x50CF;&#x89C6;&#x56FE;&#x7684;&#x5927;&#x5C0F;</span>
    [<span class="hljs-keyword">self</span><span class="hljs-variable">.imageView</span> sizeToFit];

    <span class="hljs-comment">// 3. &#x8BBE;&#x7F6E;&#x6EDA;&#x52A8;&#x89C6;&#x56FE;&#x7684; contentSize</span>
    <span class="hljs-keyword">self</span><span class="hljs-variable">.scrollView</span><span class="hljs-variable">.contentSize</span> = image<span class="hljs-variable">.size</span>;
}
</code></pre>
<h3 id="%E8%AE%BE%E7%BD%AE%E6%BB%9A%E5%8A%A8%E8%A7%86%E5%9B%BE%E7%9A%84%E7%BC%A9%E6%94%BE">&#x8BBE;&#x7F6E;&#x6EDA;&#x52A8;&#x89C6;&#x56FE;&#x7684;&#x7F29;&#x653E;</h3>
<p>1&gt; &#x8BBE;&#x7F6E;&#x6EDA;&#x52A8;&#x89C6;&#x56FE;&#x7F29;&#x653E;&#x5C5E;&#x6027;</p>
<pre><code class="lang-objc"><span class="hljs-comment">// 1&gt; &#x6700;&#x5C0F;&#x7F29;&#x653E;&#x6BD4;&#x4F8B;</span>
<span class="hljs-keyword">self</span><span class="hljs-variable">.scrollView</span><span class="hljs-variable">.minimumZoomScale</span> = <span class="hljs-number">0.5</span>;
<span class="hljs-comment">// 2&gt; &#x6700;&#x5927;&#x7F29;&#x653E;&#x6BD4;&#x4F8B;</span>
<span class="hljs-keyword">self</span><span class="hljs-variable">.scrollView</span><span class="hljs-variable">.maximumZoomScale</span> = <span class="hljs-number">2.0</span>;
<span class="hljs-comment">// 3&gt; &#x8BBE;&#x7F6E;&#x4EE3;&#x7406;</span>
<span class="hljs-keyword">self</span><span class="hljs-variable">.scrollView</span><span class="hljs-variable">.delegate</span> = <span class="hljs-keyword">self</span>;
</code></pre>
<p>2&gt; &#x5B9E;&#x73B0;&#x4EE3;&#x7406;&#x65B9;&#x6CD5; - &#x544A;&#x8BC9;&#x6EDA;&#x52A8;&#x89C6;&#x56FE;&#x7F29;&#x653E;&#x54EA;&#x4E00;&#x4E2A;&#x89C6;&#x56FE;</p>
<pre><code class="lang-objc">- (<span class="hljs-built_in">UIView</span> *)viewForZoomingInScrollView:(<span class="hljs-built_in">UIScrollView</span> *)scrollView {
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">self</span><span class="hljs-variable">.imageView</span>;
}
</code></pre>
<p>3&gt; &#x8DDF;&#x8E2A; <code>scrollView</code> &#x7F29;&#x653E;&#x6548;&#x679C;</p>
<pre><code class="lang-objc">- (<span class="hljs-keyword">void</span>)scrollViewDidZoom:(<span class="hljs-built_in">UIScrollView</span> *)scrollView {
    <span class="hljs-built_in">NSLog</span>(<span class="hljs-string">@&quot;%@&quot;</span>, NSStringFromCGAffineTransform(<span class="hljs-keyword">self</span><span class="hljs-variable">.imageView</span><span class="hljs-variable">.transform</span>));
}
</code></pre>
<h3 id="%E7%BA%BF%E7%A8%8B%E9%97%B4%E9%80%9A%E8%AE%AF">&#x7EBF;&#x7A0B;&#x95F4;&#x901A;&#x8BAF;</h3>
<ul>
<li>&#x5728;&#x540E;&#x53F0;&#x7EBF;&#x7A0B;&#x4E0B;&#x8F7D;&#x56FE;&#x50CF;</li>
</ul>
<pre><code class="lang-objc">[<span class="hljs-keyword">self</span> performSelectorInBackground:<span class="hljs-keyword">@selector</span>(downloadImage) withObject:<span class="hljs-literal">nil</span>];
</code></pre>
<ul>
<li>&#x5728;&#x4E3B;&#x7EBF;&#x7A0B;&#x8BBE;&#x7F6E;&#x56FE;&#x50CF;</li>
</ul>
<pre><code class="lang-objc">[<span class="hljs-keyword">self</span> performSelectorOnMainThread:<span class="hljs-keyword">@selector</span>(setImage:) withObject:image waitUntilDone:<span class="hljs-literal">NO</span>];
</code></pre>

                    
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